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<p style="margin-right:0cm"><span style="font-size:11pt"><span style="font-family:Calibri,sans-serif">The formation of the Sun, the Solar System and the subsequent emergence of life on Earth may be a consequence of a collision between our galaxy, the Milky Way, and a smaller galaxy called Sagittarius, according to researchers.</span></span></p>
<p style="margin-right:0cm"> </p>
<p style="margin-right:0cm"><span style="font-size:11pt"><span style="font-family:Calibri,sans-serif"><strong>Background</strong></span></span></p>
<p style="margin-right:0cm"><span style="font-size:11pt"><span style="font-family:Calibri,sans-serif">Previous studies suggested that Sagittarius, a so called dwarf galaxy, had had a profound effect on how stars move in the Milky Way. Some even claim that the massive Milky Way's trademark spiral structure might be a result of the at least three known crashes with Sagittarius over the past six billion years.</span></span></p>
<p style="margin-right:0cm"> </p>
<p style="margin-right:0cm"><span style="font-size:11pt"><span style="font-family:Calibri,sans-serif"><strong>Details</strong></span></span></p>
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<li>
<p><span style="font-size:11pt"><span style="font-family:Calibri,sans-serif">Astronomers have known that Sagittarius repeatedly smashes through the Milky Way's disc, as its orbit around the galaxy's core tightens as a result of gravitational forces.</span></span></p>
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<li>
<p><span style="font-size:11pt"><span style="font-family:Calibri,sans-serif">A new study, based on data gathered by ESA's galaxy mapping powerhouse Gaia, revealed for the first time that the influence of Sagittarius on the Milky Way may be even more substantial. </span></span></p>
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<p><span style="font-size:11pt"><span style="font-family:Calibri,sans-serif">The ripples caused by the collisions seem to have triggered major star formation episodes, one of which roughly coincided with the time of the formation of the Sun some 4.7 billion years ago.</span></span></p>
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<li>
<p><span style="font-size:11pt"><span style="font-family:Calibri,sans-serif">The researchers looked at luminosities, distances and colours of stars within a sphere of about 6500 light years around the Sun and compared the data with existing stellar evolution models.</span></span></p>
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<li>
<p><span style="font-size:11pt"><span style="font-family:Calibri,sans-serif">In some areas of the Milky Way, ripples would lead to higher concentrations of dust and gas, while emptying others. The high density of material in those areas would then trigger the formation of new stars.</span></span></p>
</li>
<li>
<p><span style="font-size:11pt"><span style="font-family:Calibri,sans-serif">Every collision stripped Sagittarius of some of its gas and dust, leaving the galaxy smaller after each passage. Existing data suggest that Sagittarius might have passed through the Milky Way's disc again quite recently.</span></span></p>
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<li>
<p><span style="font-size:11.0pt"><span style="font-family:"Calibri","sans-serif"">It is possible that even the Sun and its planets would not have existed if the Sagittarius dwarf had not gotten trapped by the gravitational pull of the Milky Way and eventually smashed through its disc.</span></span></p>
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<p style="margin-right:0cm"><span style="font-size:11pt"><span style="font-family:Calibri,sans-serif"><strong>Background</strong></span></span></p>
<p style="margin-right:0cm"><span style="font-size:11pt"><span style="font-family:Calibri,sans-serif">Previous studies suggested that Sagittarius, a so called dwarf galaxy, had had a profound effect on how stars move in the Milky Way. Some even claim that the massive Milky Way's trademark spiral structure might be a result of the at least three known crashes with Sagittarius over the past six billion years.</span></span></p>
<p style="margin-right:0cm"> </p>
<p style="margin-right:0cm"><span style="font-size:11pt"><span style="font-family:Calibri,sans-serif"><strong>Details</strong></span></span></p>
<ul>
<li>
<p><span style="font-size:11pt"><span style="font-family:Calibri,sans-serif">Astronomers have known that Sagittarius repeatedly smashes through the Milky Way's disc, as its orbit around the galaxy's core tightens as a result of gravitational forces.</span></span></p>
</li>
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<p><span style="font-size:11pt"><span style="font-family:Calibri,sans-serif">A new study, based on data gathered by ESA's galaxy mapping powerhouse Gaia, revealed for the first time that the influence of Sagittarius on the Milky Way may be even more substantial. </span></span></p>
</li>
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<p><span style="font-size:11pt"><span style="font-family:Calibri,sans-serif">The ripples caused by the collisions seem to have triggered major star formation episodes, one of which roughly coincided with the time of the formation of the Sun some 4.7 billion years ago.</span></span></p>
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<p><span style="font-size:11pt"><span style="font-family:Calibri,sans-serif">The researchers looked at luminosities, distances and colours of stars within a sphere of about 6500 light years around the Sun and compared the data with existing stellar evolution models.</span></span></p>
</li>
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<p><span style="font-size:11pt"><span style="font-family:Calibri,sans-serif">In some areas of the Milky Way, ripples would lead to higher concentrations of dust and gas, while emptying others. The high density of material in those areas would then trigger the formation of new stars.</span></span></p>
</li>
<li>
<p><span style="font-size:11pt"><span style="font-family:Calibri,sans-serif">Every collision stripped Sagittarius of some of its gas and dust, leaving the galaxy smaller after each passage. Existing data suggest that Sagittarius might have passed through the Milky Way's disc again quite recently.</span></span></p>
</li>
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<p><span style="font-size:11.0pt"><span style="font-family:"Calibri","sans-serif"">It is possible that even the Sun and its planets would not have existed if the Sagittarius dwarf had not gotten trapped by the gravitational pull of the Milky Way and eventually smashed through its disc.</span></span></p>
</li>
</ul>
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